Carefullymonitoring the "level" of your pants' waistband so as not to reveal your "plumber's crack' when working in public.
"Watching the bottom line" can also refer to a bystander's lengthy observation of someone who is unknowingly "mooning the world" while engrossed in the task he's performing. Sometimes you can gain a bit of extra folding-money if you make a bet with anyone else who's with you about how long it'll be before the clueless butt-exposer either realizes his faux pas or someone else yells at him to pull his pants up.
"Watching Steven Segal" is the act of making and eating hamburgers using the raw hamburger meat and cum left over after a man fills a quart milk carton full of luke-warm raw hamburger meat and makes sweet love to it.